<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
</head>
<body>
	<script type="text/javascript">
	     //var a=Math.pow(3,4);//3的4次方
	    
	     //console.log(a);//81
	     
	     //math是英语数学,pow就是乘方的意思
	     
	     //var a=Math.pow(3,4*5);
	     //console.log(a);
	     
	     //var a =Math.pow(3,Math.pow(4,6));
	     //console.log(a);
	     
	     //开根号
	     var a=Math.sqrt(81);
	     console.log(a);//9
	     
	</script>
</body>
</html>
